thermodynamics Flashcards
thermal energy of an object natually moved from hot to cold or cold to hot
hot to cold
movement of thermal energy due to temp difference is called what
heat transfer
what will heat transfer contine to until what happens
thermal equilibrium at the same temp
what is the coefficient of volume expansion
3alpha
why do most gases have the same volume expansion coefficient at atmospheric pressure
(what 2 things do they have in common)
and what type of gases are they called
- volume of he atom or molecule is very small compared with the volume available
- atoms dont stick together
ideal gases
when does PV=nRT fail
- when temp is low enough
- volume is small enough
going from solid to liquid and liquid to gas
will Q be positive or negative
postive
going from liquid to solid and gas to liquid
will Q be positive or negative
negative
what are the 3 process of heat transfer
- conduction
- convection
- radiation
what process of heat transfer is this
- takes places on solids, liquid and gases
- molecules exchange thermal energy without changing mean
- slow process
conduction
what process of heat transfer is this
- takes place in liquid and gases
- molecules carry thermal energy while changing their mean position
- more rapid
convection
what process of heat transfer is this
- no medium required
- electromagnetic radiation
radiation
for an isolated system the total thermal energy is conserved or not conserved when 2 objects are put in thermal contact
conserved
dull black surfaces normally have emisivities between what
0.9-1.0
what is the 1st law of thermodynamics about
energy conservation
